A marathon here or triathlon there doesn’t make a huge impact on San Diego’s economy, but combine all of last year’s endurance events and they provide a decent boost.

That’s the conclusion of a new study by the National University System Institute for Policy Research, which measured the economic effect of 66 marathons, mud runs, triathlons and open water swims that took place in San Diego County last year.

In all, the study found that out-of-towners who come for the events generated $64.1 million in economic output for the region, such as registration fees, rental costs, hotel stays and restaurants. The events also accounted for $21.3 million in wages to 583 workers for direct, indirect, or induced jobs.

“What you’re seeing is this effect of people who come here for the race, they’ll bring their friends and family and then they’ll go to the zoo or SeaWorld, or shopping at Fashion Valley,” said Vince Vasquez, a senior policy analyst at National University who authored the study.

More than 134,000 people participated in endurance events here last year, with 31,029 of them coming from out of town, according to the study. Those are the people measured because they spend money that otherwise would not have been spent here. Additionally, 18,207 participants came from outside the “drive” market, meaning they likely flew in, stayed longer, and spent more, Vasquez said.

“They say, ‘I’ll come here for the race and go out and make the most of the time out here,’” he said.

For the Rock ’n’ Roll Marathon, the largest event last year, nearly 15,000 of the 24,642 participants were from outside San Diego County, National University reports. On its own, that number of visitors wouldn’t have the same impact as an event like Comic-Con, which is estimated to have generated $78 million in spending in San Diego, including $24.7 million at hotels.

The Holiday Bowl at Qualcomm Stadium brings in fans of two universities outside San Diego. Last year, the game generated a $23.9 million economic impact to San Diego, which included 24,771 fans traveling from outside the county to attend the game, generating 26,566 room nights.

“Individual events are not in a league with those events,” said Alan Gin, economist at the University of San Diego, who was not involved with the study. “We have a lot of (endurance) events and cumulatively they do have some impact, probably not in the realm of a Comic-Con.”

Vasquez, a runner himself, said he hopes the study is used to broaden the endurance events in San Diego County, where the weather is good year round. For instance, he said, most of the events are held in coastal areas or Balboa Park, but there’s no reason an East County city like El Cajon couldn’t host a marathon in December.